Abstract: In this paper, the finite element model of a 54 m segmented wind turbine is established, and the stiffness and modal analysis are carried out for the segmented blades. Calculation results show that, under the four limit condition, the segmented blades stiffness and the original blade are basically the same: Segment is consistent with the original leaf blade in the first two modes and the natural frequencies are basically consistent. Blade segments of blade vibration performance have a great impact, verifying the rationality of the segmented blades structure stiffness and the vibration performance.

Key words: finite element method, stiffness, formation, natural frequency, segmented blades